A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

UK Labour's Owen Smith to stand as leader

British opposition Labour MP Owen Smith says will run against the party's leader Jeremy Corbyn in a coming leadership contest.

The contest was triggered earlier this week when MP Angela Eagle challenged Corbyn's leadership. On Tuesday the party ruled Corbyn had the automatic right to stand in the contest without needing to be nominated by MPs.

"Jeremy is a good man with great Labour values ... but he is not a leader who can lead us into an election and win for Labour," Smith told BBC Radio.

"I have a radical and credible set of policies. I want to put that to the membership, I want to make my case to be the next leader of not just the Labour Party but the next Labour prime minister."